如何使用ggplot在条形图上添加水平线? [英] How to add a horizontal line above a bar chart using ggplot?
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问题描述
我想在条形图上添加一条水平线。目前,我可以使用 geom_points
添加点:
data< - ddply(diamonds,。(cut,color),summarize,mean_carat = mean(carat))
ggplot(data,aes(color,mean_carat,fill = cut))+
geom_bar(stat =身份,position =dodge)+
geom_point(data = data,aes(color,mean_carat,fill = cut))
下图中的红色箭头显示了我想添加的内容:
谢谢!
解决方案
试着添加一些类似于
的内容:$ p $
data2 < - ddply(data,〜color,summarize,max_carat = max(mean_carat))
C < - merge(data,data2,by = c('color'))
ggplot(data,aes(color,mean_carat,fill = cut))+
geom_bar(stat =identity,position =dodge) +
geom_point(data = data,a es(color,mean_carat))+
geom_errorbar(data = C,aes(y = max_carat,ymax = max_carat,ymin = max_carat))
I would like to add a horizontal line above a bar plot. Currently I am able to add dots using geom_points
:
data <- ddply(diamonds, .(cut, color), summarise, mean_carat = mean(carat))
ggplot(data, aes(color, mean_carat,fill=cut)) +
geom_bar(stat="identity", position="dodge") +
geom_point(data=data, aes(color, mean_carat, fill=cut))
The red arrow in the image below shows what I would like to add:
Thanks!
解决方案
Try to add something like
data <- ddply(diamonds, .(cut, color), summarise, mean_carat = mean(carat))
data2 <- ddply(data, ~color, summarise, max_carat = max(mean_carat))
C <- merge(data,data2, by = c('color'))
ggplot(data, aes(color, mean_carat,fill=cut)) +
geom_bar(stat="identity", position="dodge") +
geom_point(data=data, aes(color, mean_carat)) +
geom_errorbar(data = C, aes(y=max_carat, ymax=max_carat, ymin=max_carat))
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